<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <style>
        header{height: 150px ; background: pink; margin-bottom: 10px;}
        .aside{display:inline-block; width: 295px; background: red; height: 300px;}
        .article{display:inline-block;width: 460px; background: pink; height: 300px;}
    </style>
    <body>
        <header></header>
        <div>
            <span class="aside">
                前面内容
            </span>
            <span class="article">后面内容</span>
        </div>
        
    </body>
    
</body>
</html>